Stir in cheese, dry mustard, salt and pepper. Mix well until cheese is melted. Pour over macaroni and combine well.Pour into ungreased casserole, sprinkle with paprika, cover and bake into preheated oven of 350˚F for 20 to 25 minutes or until cheese is bubbling. If you like a "crust" over your macaroni bake it for 10 more minutes uncovered.Serve with your favorite sandwich, or with ham, or any other combination you like..... even grilled cheese sandwich.